Suppose that a researcher, using data on class size (CS) and average test scores from 92 thirdgrade classes, estimates the OLS regression A TesfScore = 473.564 + ( - 5.2962) x CS, R2 = 0.08. SER = 10.5. A classroom has 20 students. The regression's prediction for that classroom's average test score is 367.64 . (Round your response to two decimal places.) Last year a classroom had 17 students, and this year it has 21 students. The regression's prediction for the change in the classroom average test score is - 21 .18'. (Round your response to two decimal places.) The sample average class size across the 92 classrooms is 19.47. The sample average of the test scores across the 92 classrooms is 370.44 . (Hint: Review the formulas for the OLS estimators.) (Round your response to two decimal places.) The sample standard deviation of test scores across the 92 classrooms is D. (Hint: Review the formulas for the R2 and SER.) (Round your response to one decimal place.)